不同毛竹纯林枯落物养分含量和贮量的比较

运用定位研究法采集位于浙江富阳路西林区垦复与未垦复毛竹(Phyllostachys edulis)纯林枯落物样品(2002~2003年),对其枯落物的量进行比较。结果表明:不论夏季或冬季,未垦复毛竹林枯落物烘干重量均显著高于垦复毛竹林,未垦复毛竹林冬季枯落物烘干重量是垦复毛竹林的1.65~5.74倍。不同毛竹林枯落物养分呈现相似的变化特征,即垦复毛竹林枯落物养分含量和贮量由高到低序列为:Ca、K、Mg、N、P,养分含量0.16~3.3 g/kg,养分贮量0.20~4.50 kg/hm2;未垦复毛竹林相应序列是Ca、K、N、Mg、P,养分含量0.20~5.10 g/kg,养分贮量0.70~29.10 kg/hm2。毛竹林垦复之后由于林地表层的枯落物数量大为减少,枯落物养分贮量也显著低于未垦复毛竹林,因而制约潜在肥力的稳定提高,进行土壤管理时应引起注意。

Comparison on Dry Weight and Nutrient Storage of Litter in Pure Phyllostachys edulis Stands

This paper studied on the status of litter collected in different phases from 2002 to 2003 in December at reclamation and non reclamation pure Phyllostachys edulis stands by means of fixed monitoring in Luxi forest region,Fuyang county,Zhejiang province,P.R.C.ANOVA results showed that the dry weight of litter in reclamation Ph.edulis stands was more significantly reduced than that in non reclamation one in summer or in winter,It indicated that the average dry weight of litter in non reclamation one was 1.65~5.74 times than that of reclamation's stands in winter.It also appeared similar variation characteristics for nutrient of litter in different Ph.edulis stands: The order of nutrient content or storage of litter in reclamation stands was as follow: c(Ca)>c(K)>c(Mg)>c(N)>c(P),it indicated that nutrient content or storage range from 0.16~(3.3 g/kg) and 0.20~4.50 kg/hm~2,respectively.Whereas non reclamation stands was as follows:c(Ca)>c(K)>c(N)>c(Mg)>c(P),the nutrient content ranged from 0.20~5.10 g/kg while nutrient storage was from 0.70~29.10 kg/hm~2,respectively.Not only the amount of letter covered on soil surface greatly reduced,but also nutrient storage was significantly lower after reclamation in Ph.edulis stands.Thus sufficient attention should be paid to soil management for reclamation to restrict steady improvement of potential soil fertility.